44 lines
1.6 KiB
C#
44 lines
1.6 KiB
C#
using System.Collections.Generic;
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using Microsoft.Xna.Framework.Graphics;
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using Engine.Core;
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namespace Engine.Integration.MonoGame;
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public class SpriteBatcher : Behaviour, IFirstFrameUpdate, IDraw
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{
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private static Comparer<int> SortByPriority() => Comparer<int>.Create((x, y) => y.CompareTo(x));
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private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
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private ISpriteBatch spriteBatch = null!;
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private MonoGameCamera2D camera2D = null!;
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private readonly RasterizerState rasterizerState = new() { CullMode = CullMode.CullClockwiseFace };
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private readonly ActiveBehaviourCollectorOrdered<int, IDrawableSprite> drawableSprites = new(GetPriority(), SortByPriority());
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public void FirstActiveFrame()
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{
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MonoGameWindowContainer windowContainer = Universe.FindRequiredBehaviour<MonoGameWindowContainer>();
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camera2D = Universe.FindRequiredBehaviour<MonoGameCamera2D>();
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spriteBatch = new SpriteBatchWrapper(windowContainer.Window.GraphicsDevice);
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drawableSprites.Unassign();
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drawableSprites.Assign(Universe);
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}
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public void Draw()
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{
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Matrix4x4 transformMatrix = Matrix4x4.Identity
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.ApplyTranslation(new Vector2D(camera2D.Viewport.X, camera2D.Viewport.Y) * .5f)
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.ApplyScale(new Vector3D(1f, -1f, 1f))
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.ApplyMatrix(camera2D.ViewMatrix)
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.Transposed;
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spriteBatch.Begin(transformMatrix: transformMatrix.ToXnaMatrix(), rasterizerState: rasterizerState);
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for (int i = 0; i < drawableSprites.Count; i++)
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drawableSprites[i].Draw(spriteBatch);
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spriteBatch.End();
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}
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}
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